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# File 'lib/kpeg/code_generator.rb', line 99
def output_op(code, op, indent=2)
case op
when Dot
code << indentify("_tmp = get_byte\n", indent)
when LiteralString
code << indentify("_tmp = match_string(#{op.string.dump})\n", indent)
when LiteralRegexp
if op.regexp.respond_to?(:kcode)
lang = op.regexp.kcode.to_s[0,1]
else
lang = ""
end
code << indentify("_tmp = scan(/\\A#{op.regexp}/#{lang})\n", indent)
when CharRange
ss = save()
if op.start.bytesize == 1 and op.fin.bytesize == 1
code << indentify("#{ss} = self.pos\n", indent)
code << indentify("_tmp = get_byte\n", indent)
code << indentify("if _tmp\n", indent)
if op.start.respond_to? :getbyte
left = op.start.getbyte 0
right = op.fin.getbyte 0
else
left = op.start[0]
right = op.fin[0]
end
code << indentify(" unless _tmp >= #{left} and _tmp <= #{right}\n", indent)
code << indentify(" self.pos = #{ss}\n", indent)
code << indentify(" _tmp = nil\n", indent)
code << indentify(" end\n", indent)
code << indentify("end\n", indent)
else
raise "Unsupported char range - #{op.inspect}"
end
when Choice
ss = save()
code << "\n"
code << indentify("#{ss} = self.pos\n", indent)
code << indentify("while true # choice\n", indent)
op.ops.each_with_index do |n,idx|
output_op code, n, (indent+1)
code << indentify(" break if _tmp\n", indent)
code << indentify(" self.pos = #{ss}\n", indent)
if idx == op.ops.size - 1
code << indentify(" break\n", indent)
end
end
code << indentify("end # end choice\n\n", indent)
when Multiple
ss = save()
if op.min == 0 and op.max == 1
code << indentify("#{ss} = self.pos\n", indent)
output_op code, op.op, indent
if op.save_values
code << indentify("@result = nil unless _tmp\n", indent)
end
code << indentify("unless _tmp\n", indent)
code << indentify(" _tmp = true\n", indent)
code << indentify(" self.pos = #{ss}\n", indent)
code << indentify("end\n", indent)
elsif op.min == 0 and !op.max
if op.save_values
code << indentify("_ary = []\n", indent)
end
code << indentify("while true\n", indent)
output_op code, op.op, (indent+1)
if op.save_values
code << indentify(" _ary << @result if _tmp\n", indent)
end
code << indentify(" break unless _tmp\n", indent)
code << indentify("end\n", indent)
code << indentify("_tmp = true\n", indent)
if op.save_values
code << indentify("@result = _ary\n", indent)
end
elsif op.min == 1 and !op.max
code << indentify("#{ss} = self.pos\n", indent)
if op.save_values
code << indentify("_ary = []\n", indent)
end
output_op code, op.op, indent
code << indentify("if _tmp\n", indent)
if op.save_values
code << indentify(" _ary << @result\n", indent)
end
code << indentify(" while true\n", indent)
output_op code, op.op, (indent+2)
if op.save_values
code << indentify(" _ary << @result if _tmp\n", indent)
end
code << indentify(" break unless _tmp\n", indent)
code << indentify(" end\n", indent)
code << indentify(" _tmp = true\n", indent)
if op.save_values
code << indentify(" @result = _ary\n", indent)
end
code << indentify("else\n", indent)
code << indentify(" self.pos = #{ss}\n", indent)
code << indentify("end\n", indent)
else
code << indentify("#{ss} = self.pos\n", indent)
code << indentify("_count = 0\n", indent)
code << indentify("while true\n", indent)
output_op code, op.op, (indent+1)
code << indentify(" if _tmp\n", indent)
code << indentify(" _count += 1\n", indent)
code << indentify(" break if _count == #{op.max}\n", indent)
code << indentify(" else\n", indent)
code << indentify(" break\n", indent)
code << indentify(" end\n", indent)
code << indentify("end\n", indent)
code << indentify("if _count >= #{op.min}\n", indent)
code << indentify(" _tmp = true\n", indent)
code << indentify("else\n", indent)
code << indentify(" self.pos = #{ss}\n", indent)
code << indentify(" _tmp = nil\n", indent)
code << indentify("end\n", indent)
end
when Sequence
ss = save()
code << "\n"
code << indentify("#{ss} = self.pos\n", indent)
code << indentify("while true # sequence\n", indent)
op.ops.each_with_index do |n, idx|
output_op code, n, (indent+1)
if idx == op.ops.size - 1
code << indentify(" unless _tmp\n", indent)
code << indentify(" self.pos = #{ss}\n", indent)
code << indentify(" end\n", indent)
code << indentify(" break\n", indent)
else
code << indentify(" unless _tmp\n", indent)
code << indentify(" self.pos = #{ss}\n", indent)
code << indentify(" break\n", indent)
code << indentify(" end\n", indent)
end
end
code << indentify("end # end sequence\n\n", indent)
when AndPredicate
ss = save()
code << indentify("#{ss} = self.pos\n", indent)
if op.op.kind_of? Action
code << indentify("_tmp = begin; #{op.op.action}; end\n", indent)
else
output_op code, op.op, indent
end
code << indentify("self.pos = #{ss}\n", indent)
when NotPredicate
ss = save()
code << indentify("#{ss} = self.pos\n", indent)
if op.op.kind_of? Action
code << indentify("_tmp = begin; #{op.op.action}; end\n", indent)
else
output_op code, op.op, indent
end
code << indentify("_tmp = _tmp ? nil : true\n", indent)
code << indentify("self.pos = #{ss}\n", indent)
when RuleReference
if op.arguments
code << indentify("_tmp = apply_with_args(:#{method_name op.rule_name}, #{op.arguments[1..-2]})\n", indent)
else
code << indentify("_tmp = apply(:#{method_name op.rule_name})\n", indent)
end
when InvokeRule
if op.arguments
code << indentify("_tmp = #{method_name op.rule_name}#{op.arguments}\n", indent)
else
code << indentify("_tmp = #{method_name op.rule_name}()\n", indent)
end
when ForeignInvokeRule
if op.arguments
code << indentify("_tmp = @_grammar_#{op.grammar_name}.external_invoke(self, :#{method_name op.rule_name}, #{op.arguments[1..-2]})\n", indent)
else
code << indentify("_tmp = @_grammar_#{op.grammar_name}.external_invoke(self, :#{method_name op.rule_name})\n", indent)
end
when Tag
if op.tag_name and !op.tag_name.empty?
output_op code, op.op, indent
code << indentify("#{op.tag_name} = @result\n", indent)
else
output_op code, op.op, indent
end
when Action
code << indentify("@result = begin; ", indent)
code << op.action << "; end\n"
if @debug
code << indentify("puts \" => \" #{op.action.dump} \" => \#{@result.inspect} \\n\"\n", indent)
end
code << indentify("_tmp = true\n", indent)
when Collect
code << indentify("_text_start = self.pos\n", indent)
output_op code, op.op, indent
code << indentify("if _tmp\n", indent)
code << indentify(" text = get_text(_text_start)\n", indent)
code << indentify("end\n", indent)
when Bounds
code << indentify("_bounds_start = self.pos\n", indent)
output_op code, op.op, indent
code << indentify("if _tmp\n", indent)
code << indentify(" bounds = [_bounds_start, self.pos]\n", indent)
code << indentify("end\n", indent)
else
raise "Unknown op - #{op.class}"
end
end
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